
The Mississippi River and Illinois River corridors define this regional landscape, serving as the primary arteries for commerce and settlement across western Illinois and northeastern Missouri. By 1980, the river economy is complemented by a dense rail network, including the Burlington Northern and Norfolk and Western lines that connect established river towns like Quincy and Hannibal to interior agricultural hubs such as Jacksonville and Mexico. Conservation efforts are evident in the numerous protected wetlands along the river bottoms, such as the Clarence Cannon National Wildlife Refuge and Meredosia National Wildlife Refuge. Further inland, the map documents the character of the Pike County Hills and Calhoun County Hills, where smaller communities like Pittsfield and Jerseyville serve as centers for the surrounding rural counties.
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